Electric heating device.



8 O 9 1 6 1 E N U J D E T N E T A ELECTRIC HEATING DEVICE.

APPLICATION FILED 535F126. 1907.

INVENTOR ATTbRNEY 'sistance units by which they are raised to the new and useful Improvement in Electric and the assembled-heater may be used in connection with stamplng and emboss ng I have gained a considerable advantage over view to mechanical strength and durability.

f illustrated comprises a lurality of rods 1, 2, 3,4, 5, 6, 7, 8, 9,10 an 11 which are of subbled side by side in a fiat box or frame 12, "which comprises side strips 13 and 14, end

.cated 'inthe center.

Q UNITED STATES OFFICE.

WILLlA M 5. HA HA WAY, Jlt, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO HADAWAY ELEC- Tltlb lIllAlING & ENGINEERING COM PANY, A CORPORATION OF NEW YORK.

ELECTRIC HEATING DEVICE.

To all whom it may concern:

' Be it known that 1, WILLIAM S. HADAWAY, J12, a citizen of the United States, and a resident of .East Orange, in the county of Essex and State of New Jersey, have invented a Heating Devices, of which the following is a specification.

. My invention relates to electric heating devices, and it has for its object to provide devices of this character which are adapted for use with embossing presses and other similar mechanisms Where the are subjected to heavy ressure and shoe The ieating device of my present invention comprises a plurality of rods of heateonducting material which are assembled side by side and are provided with electrical redesired temperature.

I The construction is very compact and rigid press machinery, and may form the Working surfaces for. matrix drying presses. The heater may also beus'ed as a stove for heatin small tools such as are used by finishers and bookbinders and for various-other purposes.

the devices used in the prior art for similar purposes by insuring a uniform distribution of eat over the heating surface, and by specially constructing the heater, with a Figure 1 of the aceompanying'drawings is a plan view, with the cover removed, of a dej vice constructed in accordance with my invention. Fi 2 is a sectional elevation on line I1II 0 Fig. 1, and Fig. 3 is a side elevation of thesame. Fig. 4 is a detail view of heater disclosed in the other figures.

Referringto the drawings, the device here stantially the same thickness and are assemst'ri'ps 1 5, and 16 and cover plates 17 and 18. The rods are of different widths, the narrower rods being located nearer the side strips 1 3 and 14 and the Widest rod being lo- 1, .Terminal members 19 and 20 are secured to and are insulated from the end strip 15 by 1 Specification of Letters Patent.

Application filed September 26, 1907.

Patented June 16, 1908.

Serial No. 394,745.

binding nuts 21 and insulating Washers 22.

The outer extremities of the terminals are protected by a sheath 23 that is secured to the end strips by screws 24. The inner extremities of the terminals are screw-threaded and are provided with nuts 25 by means of which the ends of a resistance strip 26 maybe 'end of the frame, thence back between the rods 1 and 2, then away from the terminal end between the rods 2 and 3, and so on until some part of it is disposed between each two adjacent rods and its free end is then connected to the other terminal of the device.

. electrically connected to the terminal memernately so The strip is insulated from theb-a'rsb mica or other suitable insulating material w rich is not injured by relatively hi h tern eratures, and in order that the ends 0 the rods may be maintained at substantially the same temperature as their middle portions, without destroying the insulating strip at the corners where relatively sharp bends are made, the slots 27 and 28 are made closer together in those portions of the strip' which come close to the ends of the rods and the slots are omitted entirely at those portions of the strip in which the bends occur. It may be desirable to reduce the width of the strip at these points to some extent, as indicated in Fig. 4.

By making the middle rods of the heater materially wider than those nearer the outer edges, the temperature of the heating surfaces formed by the cover plates 17 and 18 is substantially uniform, since those parts which are farthest removed from the center of the mass are provided with the greater amounts of heating surface per unit volume. The rods 1 to 11 are held in position in the frame formed by the parts 13, 14, 15 and 16 by means of a clampmg red 29 which is interposed between the assembled rods and the side strip 14 and which is engaged by a plurality o clamping screws 39 which extend through tapped holes in the side strip 14. 111' some cases it may be desirable to omit the plates 17 and 18 entirely or one of them, and when this is done the resistance strip may preferably be sunk into suitable slots which may be provided in the ends of the heating rod in order that they may be suitably protected from injury.

I desire that variations in the size and in the arrangement of details which do not deart from the spirit of my invention shall be included Within its scope, and that only such limitations shall be imposed as are indicated in the appended claims.

I claim as my invention:

1. A heating device comprising a lurality of rods of diilerent Widths assembled side by side, and means located between the rods for imparting heat thereto.

2. A heating device comprising a plurality of rods of substantially uniform thickness and of different widths assembled side by side with the Wider rods nearest the middle, and means located between the rods for im parting heat thereto.

3. An electric heating device ccmprisi'n a plurality of rods dis osed side by side, an a resistance strip whic extends back and forth between therods and is insulated from them.

4. An electric heating device comprising a relatively flat frame or box of heat-conducting material, a plurality of rods of substantially uniform thickness assembled side by side between the cover plates of the box, and

a stri of resistance material threaded back and 'orth between the rods and. insulated from the box and from the rods.

5. An electric heating device comprising a box or frame having cover plates of heatconducting material, and terminal'members secured to one end, a plurality of rods of substantially uniform thickness and of different Widths disposed Within the box between the cover plates, the Wider rods being located near the center of the box, and a strip of resistance material slo'tted to provide a zigzag path for electric current, the ends of the strip eing secured to the terminals of the device and the body of the strip being threaded through the s aces formed between the rods and insulate from the 'rods and from the box.

In testimony whereof, I have hereunto subscribed my name this 12th day oftSepternber, 1907.

WILLIAM S. HADAWAY, JR. 

